product description 1.Because of these hand grip circles are palm size, you can use them at any time. 2.Release Pressure: The people who work a long time in the office can consider the grip strength trainer set. As a relaxing daily exercise, hand strengthener grip equipment can exercise finger flexibility, arm muscles, and promote blood circulation. 3. Suit Most People Healthy Lifestyle: Adjustable finger strengthener with free combination, which fits for kids, adults, even the elder. Different hand grip postures can get different exercise experience, superimposed use and different holding postures can also exercise hand strength. An easy exercise, easy life. 4.Versatile, durable and excellent product 5.Suitable for both men and women, perfect and useful gift . Size: Diameter: 70mm, Inner Diameter: 33mm, Thickness: 18mm Orange: 50lb, Green: 30lb, Blue: 40lb